1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
Copyright (C) 1994, 1995, 1996, 1997, 1999 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include <string.h>
#include <fcntl.h>
#include <hurd/pager.h>
/* Actually read or write a file. The file size must already permit
the requested access. NP is the file to read/write. DATA is a buffer
to write from or fill on read. OFFSET is the absolute address (-1
not permitted here); AMT is the size of the read/write to perform;
DIR is set for writing and clear for reading. The inode must
be locked. If NOTIME is set, then don't update the mtime or atime. */
error_t
_diskfs_rdwr_internal (struct node *np,
char *data,
off_t offset,
size_t *amt,
int dir,
int notime)
{
memory_object_t memobj;
vm_prot_t prot = dir ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ;
error_t err = 0;
if (dir)
assert (!diskfs_readonly);
if (!diskfs_check_readonly () && !notime)
{
if (dir)
np->dn_set_mtime = 1;
else
np->dn_set_atime = 1;
}
memobj = diskfs_get_filemap (np, 0, prot);
if (memobj == MACH_PORT_NULL)
return errno;
err = pager_memcpy (diskfs_get_filemap_pager_struct (np), memobj,
offset, data, amt, prot);
if (!diskfs_check_readonly () && !notime)
{
if (dir)
np->dn_set_mtime = 1;
else
np->dn_set_atime = 1;
}
mach_port_deallocate (mach_task_self (), memobj);
return err;
}
|
